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Figure 3
FWHM spot size of the refocused beam at the secondary interaction plane calculated for a Gaussian spectral bandwidth (BW) at LCLS between 0.0001 (0.01%) and 0.003 (0.3%). This was obtained by performing wave propagation calculations from a Gaussian source through the multiple focusing optics to the refocused plane. This was performed at multiple energies and then incoherently summed over the spectral bandwidth. The process was repeated for different central photon energies while keeping the bandwidth constant for each of the curves.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 22| Part 3| May 2015| Pages 634-643
https://doi.org/10.1107/S1600577515004002
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